Class ByteStoreRowStore
java.lang.Object
uk.ac.starlink.table.storage.ByteStoreRowStore
- Direct Known Subclasses:
DiskRowStore
RowStore based on a ByteStore.
It uses custom serialization to encode some basic data types
(primitives, Strings, and arrays of them) as a byte sequence.
Therefore it may not cope with tables containing exotic objects.
The actual storage destination is controlled by the
ByteStore implementation used.- Since:
- 5 Nov 2009
- Author:
- Mark Taylor
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoidacceptMetadata(StarTable meta) Takes delivery of a row-lessStarTableobject which defines the metadata of the table to be transmitted.voidTakes delivery of one row of data.voidendRows()Signals that there are no more rows to be transmitted.Returns the underlying storage for this row store.Obtains a StarTable which contains the data and metadata that have been written into this sink.
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Constructor Details
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ByteStoreRowStore
Constructor.- Parameters:
byteStore- storage container used by this row store
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Method Details
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getByteStore
Returns the underlying storage for this row store.- Returns:
- buffer holding byte data
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acceptMetadata
Description copied from interface:TableSinkTakes delivery of a row-lessStarTableobject which defines the metadata of the table to be transmitted. If the number of rows that will be transmitted via subsequent calls toacceptRowis known, this value should be made available as the row count ofmeta(StarTable.getRowCount()); if it is not known, the row count should be -1. However, this object should not attempt to read any ofmeta's cell data.The data to be transmitted in subsequent calls of
acceptRowmust match the metadata transmitted in this call in the same way that rows of a StarTable must match its own metadata (number and content clases of columns etc). If this sink cannot dispose of a table corresponding tometathen it may throw a TableFormatException - this may be the case if for instancemetahas columns with types that this sink can't deal with.- Specified by:
acceptMetadatain interfaceTableSink- Parameters:
meta- table metadata object- Throws:
TableFormatException- if this sink cannot accept table rows matching the given metadata
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acceptRow
Description copied from interface:TableSinkTakes delivery of one row of data.rowis an array of objects comprising the contents of one row of the table being transmitted. The number and classes of the elements ofroware described by the metadata object previously accepted.- Specified by:
acceptRowin interfaceTableSink- Parameters:
row- table data row- Throws:
IOException
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endRows
Description copied from interface:TableSinkSignals that there are no more rows to be transmitted.- Specified by:
endRowsin interfaceTableSink- Throws:
IOException
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getStarTable
Description copied from interface:RowStoreObtains a StarTable which contains the data and metadata that have been written into this sink. In general it is only legal to call this method following a call toTableSink.endRows(); failing to observe this sequence may earn you anIllegalStateException- Specified by:
getStarTablein interfaceRowStore- Returns:
- a random-access StarTable containing the written rows
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